Inga problem, då vet vi ju vad som krånglar 
Sidan som gäller din version är alltså följande: http://forum.xda-developers.com/showthread.php?t=568032
Det står ganska bra beskrivet hur man ska göra där och du är ju redan halvvägs:
Kod:
NEW INSTALL (ie. never installed CM 4.1.99 or greater before):
1. Download HTC ADP 1.6 DRC83
(http://www.androidspin.com/downloads...ooted_base.zip)
2. Download CyanogenMod 4.2.1
(http://n0rp.chemlab.org/android/upda...2.1-signed.zip)
3. Download the Kernel Port file (see below)
4. Copy all three .zip files to your SD and reboot in recovery mode (press Home+Power at the same time or fastboot into your recovery)
5. Do a "Wipe data/factory reset"
6. Do a "Wipe SD: ext partition" ** (see below)
(it is recommended to wipe your Apps2SD partition for this release)
7. Apply Zip: HTC_ADP_1.6_DRC83_rooted_base.zip
8. Apply Zip: update-cm-4.2.1-signed.zip
9. Apply Kernel Port Zip: rad-4.xxxx.zip
10. Reboot
11. Either grab some popcorn and watch adb lolcat as it goes past, or go do something else.. this might take a while